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Purpose

The purpose of this study is to compare sacituzumab tirumotecan as a single agent, and in combination with pembrolizumab, versus Treatment of Physician's Choice (TPC) in participants with hormone receptor positive/human epidermal growth factor receptor-2 negative (HR+/HER2-) unresectable locally advanced, or metastatic, breast cancer. The primary hypotheses are that sacituzumab tirumotecan as a single agent and sacituzumab tirumotecan plus pembrolizumab are superior to TPC with respect to progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) by blinded independent central review (BICR) in all participants.

Condition

Eligibility

Eligible Ages
Over 18 Years
Eligible Sex
All
Accepts Healthy Volunteers
No

Inclusion Criteria

  • Has unresectable locally advanced or metastatic centrally-confirmed hormone receptor positive (HR+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer - Has radiographic disease progression on one or more lines of endocrine therapy for unresectable locally advanced/metastatic HR+/HER2- breast cancer, with one in combination with a CDK4/6 inhibitor - Is a chemotherapy candidate - Has an eastern cooperative oncology group (ECOG) performance status of 0 to 1 assessed within 7 days before randomization - Has adequate organ function - Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy - Participants who are Hepatitis B surface antigen (HBsAg) positive are eligible if they have received HBV antiviral therapy for at least 4 weeks, and have undetectable HBV viral load - Participants with a history of Hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable

Exclusion Criteria

  • Has breast cancer amenable to treatment with curative intent - Has experienced an early recurrence (<6 months after completing adjuvant/neoadjuvant chemotherapy) and therefore is eligible to receive second-line (2L) treatment - Has symptomatic advanced/metastatic visceral spread at risk of rapidly evolving into life-threatening complications - Has received prior chemotherapy for unresectable locally advanced or metastatic breast cancer - Active autoimmune disease that has required systemic treatment in the past 2 years - History of (noninfectious) pneumonitis/interstitial lung disease that requires steroids, or has current pneumonitis/interstitial lung disease - Has an active infection requiring systemic therapy

Study Design

Phase
Phase 3
Study Type
Interventional
Allocation
Randomized
Intervention Model
Parallel Assignment
Primary Purpose
Treatment
Masking
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
Experimental
Arm A: Sacituzumab tirumotecan 		Participants receive 4 mg/kg of sacituzumab tirumotecan once every 2 weeks (Q2W) via intravenous (IV) infusion until progressive disease or discontinuation.
  • Drug: Sacituzumab tirumotecan
    IV infusion
    Other names:
    • MK-2870
Experimental
Arm B:Pembrolizumab + Sacituzumab tirumotecan 		Participants receive 4 mg/kg of sacituzumab tirumotecan Q2W via IV infusion until progressive disease or discontinuation PLUS 400 mg of pembrolizumab once every 6 weeks (Q6W) via IV infusion for up to 18 administrations (up to ~2 years).
  • Drug: Sacituzumab tirumotecan
    IV infusion
    Other names:
    • MK-2870
  • Biological: Pembrolizumab
    IV infusion
    Other names:
    • MK-3475
    • KEYTRUDA®
Active Comparator
Arm C: Treatment of Physician's Choice (TPC) 		At the physician's discretion, participants receive chemotherapy of 80 mg/m^2 of paclitaxel once every week (Q1W) via IV infusion OR 90 mg/m^2 of paclitaxel once every 4 weeks (Q4W) via IV infusion OR 100 mg/m^2 of nab-paclitaxel Q4W via IV infusion OR 1000 mg/m^2 of capecitabine every 3 weeks (Q3W) orally OR 50 mg/m^2 of liposomal doxorubicin once every 4 weeks (Q4W) via IV infusion, until progressive disease or discontinuation.
  • Drug: Paclitaxel
    IV infusion
    Other names:
    • TAXOL®
  • Drug: Nab-paclitaxel
    IV infusion
    Other names:
    • ABRAXANE®
  • Drug: Capecitabine
    oral tablet
    Other names:
    • XELODA®
  • Drug: Liposomal doxorubicin
    IV infusion
    Other names:
    • DOXIL®

Recruiting Locations

Washington University in St. Louis and nearby locations

Washington University School of Medicine ( Site 0076)
St Louis 4407066, Missouri 4398678 63110
Contact:
Study Coordinator
314-454-8313

More Details

NCT ID
NCT06312176
Status
Recruiting
Sponsor
Merck Sharp & Dohme LLC

Study Contact

Toll Free Number
1-888-577-8839
Trialsites@msd.com

Notice

Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.